Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

CHECK DETECTED DTC
Refer to DTC Description .

Was DTC B1F0B detected?

YES

GO TO 2 .

NO

If DTC B1F0C was detected, GO TO 3

NO

If DTC B1F0D was detected, GO TO 4

NO

If DTC B1F0E was detected, GO TO 5

CHECK FRONT LEFT MICROPHONE (ACTIVE NOISE CONTROL) CIRCUITS FOR OPEN

Turn ignition switch OFF.
Disconnect BOSE speaker amp. connector B149 and front left microphone (Active Noise Control) connector.

Check continuity between BOSE speaker amp. connector B149 and front left microphone (Active Nose Control) connector R20.

BOSE speaker amp.		Front left microphone (Active Noise Control)		Continuity
Connector	Terminal	Connector	Terminal
B149	69	R20	1	Yes
	49		2

Is the inspection result normal?

YES

GO TO 6 .

Repair or replace harness or connectors.

CHECK FRONT LEFT MICROPHONE (ACTIVE NOISE CONTROL) CIRCUITS FOR SHORT

Turn ignition switch OFF.
Disconnect BOSE speaker amp. connector B149 and front left microphone (Active Nose Control) connector.

Check continuity between the terminals of BOSE speaker amp. connector B149.

Bose speaker amp. connector B149		Continuity
Terminal	Terminal	Continuity
69	49	No

Is the inspection result normal?

YES

GO TO 6 .

Repair or replace harness or connectors.

CHECK FRONT LEFT MICROPHONE (ACTIVE NOISE CONTROL) CIRCUITS FOR SHORT TO VOLTAGE

Turn ignition switch OFF.
Disconnect BOSE speaker amp. connector B149 and front left microphone (Active Nose Control) connector.
Turn ignition switch ON.

Check voltage between BOSE speaker amp. connector B149 and ground.

BOSE speaker amp.		Ground	Voltage (Approx.)
Connector	Terminal
B149	69	(-)	0 V
	49

Is the inspection result normal?

YES

GO TO 6 .

Repair or replace harness or connectors.

CHECK FRONT LEFT MICROPHONE (ACTIVE NOISE CONTROL) CIRCUITS FOR SHORT TO GROUND

Turn ignition switch OFF.
Disconnect BOSE speaker amp. connector B149 and front left microphone (Active Noise Control) connector.

Check continuity between BOSE speaker amp. connector B149 and ground.

BOSE speaker amp.		Ground	Continuity
Connector	Terminal
B149	69	-	No
	49

Is the inspection result normal?

YES

GO TO 6 .

Repair or replace harness or connectors.

CHECK FRONT LEFT MICROPHONE (ACTIVE NOISE CONTROL) SIGNAL

Turn ignition switch OFF.
Connect BOSE speaker amp. connector B149 and front left microphone (Active Nose Control) connector.
Turn ignition switch ON.

Check signal between the terminals of BOSE speaker amp. connector B149.

Bose speaker amp. connector B149		Condition	Reference value
(+)	(-)
Terminal	Terminal
69	49	Input interior sound	Courtesy of NISSAN NORTH AMERICA, INC.

Is the inspection result normal?

YES

Replace BOSE speaker amp. Refer to Removal and Installation .

Replace front left microphone (Active Noise Control). Refer to Removal and Installation - Front .